Precision microwave electrodynamics of K and Co - doped BaFe$_2$As$_2$

ORAL

Abstract

We present a detailed cavity perturbation measurement of the microwave electrodynamics of single crystal iron-based superconductors. The measurements, down to $\sim$0.4K, were performed on Ba$_{0.72}$K$_{0.28}$Fe$_2$As$_2$ hole-doped with $T_c\sim$30K, and BaFe$_{1.9}$Co$_{0.1}$As$_2$ electron-doped with $T_c\sim$20K. Our results show that the temperature dependence of the in-plane London penetration depth $\Delta\lambda(T)$ does not exhibit the exponential saturation at low temperatures expected from a fully-gapped superconductor. In addition we present broadband surface resistance measurements of two FeAs samples and discuss the behavior of the in-plane superfluid density $\rho_{ab}(T)$ in light of existing theoretical models proposed for the iron pnictides superconductors.

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Authors

  • Rinat Ofer

    University of British Columbia, University of British Colombia

  • Jake Bobowski

    University of British Colombia, University of British Columbia

  • Jordan Baglo

    University of British Colombia, University of British Columbia

  • Shun Chi

    University of British Colombia, University of British Columbia

  • James Day

    University of British Colombia, University of British Columbia

  • Pinder Dosanjh

    University of British Colombia, University of British Columbia

  • Brad Ramshaw

    University of British Columbia, University of British Colombia

  • Lynne Semple

    University of British Colombia

  • Ruixing Liang

    University of British Columbia, University of British Colombia

  • Walter Hardy

    University of British Colombia, University of British Columbia

  • Doug Bonn

    University of British Columbia, University of British Colombia